linux-firmware: RPROVIDE qcs6490 firmware packages by qcm6490 ones

linux-firmware: RPROVIDE qcs6490 firmware packages by qcm6490 ones

Qualcomm QCS6490 is a modemless variant of the QCM6490 platform. These
two platforms share most of the firmware binaries (except the IPA one).
Rather than providing complete packages, include compat symlinks into
qcom-qcm6490 firmware packages and add RPROVIDES to let other layers /
configurations use qcs6490 names to install qcm6490 packages.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>